Sensory Deprivation has been a practice for an uncertain amount of time. But, a very long time, a vast history. Similar to many different techniques, sensory deprivation has surely been practiced by shaman, oracles, and such.
But, it is a sensitive and risky practice that requires education on the methods, caution, and mastery.
I have not tried this specifically, but I am going to predict that this practice will enhance one to undergo in depth self-reflection, and even enlightenment experiences. The removal of all your extroverted senses (sight, smell, touch, hear, taste) will leave your spiritual and "paranormal" senses lingering without any interruptions.
This is ideal and practiced for forms of deep meditation to magic rituals. Once you guide your mind into focusing on itself and not on the shock of closing those senses (the shock of losing these senses is what made sensory deprivation to be used as a tool of punishment...the psychological aspect of being captured by a tyrannical authority...plus being threatened for death, and then bound as such made sensory deprivation scary and mentally disturbing).
It will take some getting used to, and I suggest you not only research the methods, as well as Pros and Cons to sensory deprivation, but also study different philosophies and practices of Meditation.
Meditation, in itself, can essentially be very similar to sensory deprivation, or even be it's own form of this practice. During deep meditative states, especially in astral projection experiences, the senses of the physical world are ideally subject to separation as one's soul relieves itself, and enters new dimensions...or even, figuratively speaking, one spiritually "loses oneself deep within the mind and soul....completely far away or avoiding the physical body's captivity".
Lastly, other than learning to focus your mind off of the initial "shock" of sensory deprivation, you will have to adjust to controlling your mind to focus and act, as much as you control your legs and arms to act. For instance, you want to look at why you feel the way you do. Your mind must precisely recollect all those feelings and the experiences/events attached to them, and "go back in time" to see what you were thinking, to even what started those feelings.
Does this help?
Good luck!
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